An ideal inductor of $\left(\frac{1}{\pi}\right) H$ is connected in series with a $300 \Omega$ resistor. If a $20 \ V, 200 \ Hz$ alternating source is connected across the combination,the phase difference between the voltage and current is

• A
  $\tan^{-1}\left(\frac{3}{4}\right)$
• B
  $\tan^{-1}\left(\frac{4}{3}\right)$
• C
  $\tan^{-1}\left(\frac{5}{4}\right)$
• D
  $\tan^{-1}\left(\frac{4}{5}\right)$